A kind of single crystal magnesium alloy biodegradable material and preparation method thereof

A technology for biodegradable materials and magnesium alloys, applied in the field of single crystal magnesium alloy biodegradable materials and their preparation, can solve the problems of accelerating the corrosion rate of magnesium alloy implanted devices, reducing the mechanical properties of materials, and the decline of mechanical properties, so as to avoid degradation. The effect of difficulty, low production cost and stable product performance

Active Publication Date: 2017-10-13
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Mg is a very active metal, and it reacts with moisture and carbon dioxide in the atmosphere at room temperature, corroding to form a gray film, and has relatively low corrosion resistance in chloride ion, acid, and electrolyte atmospheres
Body fluid is an aqueous solution containing chloride ions, organic acids, and electrolytes. The Mg implanted in the body will react with the water in the body fluid, reducing the mechanical properties of the material. Moreover, in the early stage of implantation of biological devices, due to physiological reactions, the body fluid at the implantation site will The pH value decreases rapidly, and the degradation speed of biodegradable materials is very important, not only related to whether the degradation cycle of the implant material matches the tissue healing cycle, but also affects the decline of its mechanical properties. The presence of the boundary and precipitated phases creates a potential difference between it and the magnesium matrix, which accelerates the corrosion rate of magnesium alloy implanted devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The raw materials are configured according to the following alloy composition ratio: Zn 0.1%, the rest is Mg, the total amount of impurity elements is ≤0.005%, and among the impurity elements, Fe≤0.0005%, Ni≤0.0005%, Cu≤0.001%, the raw material is 99.99% Mg , 99.99% Zn, and the raw materials are cleaned with acid and alkali and dried for later use. The preparation of the alloy is smelted with a low-carbon steel crucible that does not contain Ni and is coated with BN coating on the inner wall of the crucible. When the crucible is heated to 650 ° C, pure Mg is added for melting, and Ar+0.2% SF is used. 6 Melting under protection; when the pure Mg is completely melted and the temperature rises to 680°C, use a graphite bell jar to press alloy elements into the Mg melt, then heat up to 730°C, use rotary blowing for stirring and purification treatment, and rotary blowing of gas It is high-purity Ar gas, the gas flow rate is 30ml / min, the time is 10min, and it is ready to use ...

Embodiment 2

[0031] The raw materials are configured according to the following alloy composition ratio: Zn 3.1%, the rest is Mg, the total amount of impurity elements is ≤0.005%, and among the impurity elements, Fe≤0.0005%, Ni≤0.0005%, Cu≤0.001%, the raw material is 99.99% Mg , 99.99% Zn, and the raw materials are cleaned with acid and alkali and dried for later use. The preparation of the alloy is smelted with a low-carbon steel crucible that does not contain Ni and is coated with BN coating on the inner wall of the crucible. When the crucible is heated to 650 ° C, pure Mg is added for melting, and Ar+0.2% SF is used. 6 Melting under protection; when the pure Mg is completely melted and the temperature rises to 700°C, use a graphite bell jar to press alloy elements into the Mg melt, then heat up to 780°C, use rotary jetting for stirring and purification treatment, and rotary jetting of gas It is high-purity Ar gas, the gas flow rate is 30ml / min, the time is 15min, and it is ready to use ...

Embodiment 3

[0035] The raw materials are configured according to the following alloy composition ratio: Zn 6.2%, the rest is Mg, the total amount of impurity elements is ≤0.005%, and among the impurity elements, Fe≤0.0005%, Ni≤0.0005%, Cu≤0.001%, the raw material is 99.99% Mg , 99.99% Zn, and the raw materials are cleaned with acid and alkali and dried for later use. The preparation of the alloy is smelted with a low-carbon steel crucible that does not contain Ni and is coated with BN coating on the inner wall of the crucible. When the crucible is heated to 650 ° C, pure Mg is added for melting, and Ar+0.2% SF is used. 6 Melting under protection; when the pure Mg is completely melted and the temperature rises to 690°C, use a graphite bell jar to press the alloy elements into the Mg melt, then heat up to 760°C, use rotary blowing for stirring and purification treatment, and rotary blowing of gas It is high-purity Ar gas, the gas flow rate is 30ml / min, the time is 13min, and it is ready to ...

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Abstract

The invention relates to a single-crystal magnesium alloy biodegradable material which is characterized in that the single-crystal magnesium alloy biodegradable material is an Mg-X single-crystal biological implant material, wherein X refers to one of Zn, Ca, Gd, Dy, Y and Sm; the content of X is 0.05-25.3 percent; the rest is Mg; the total amount of impurity elements in magnesium alloy single crystal is less than or equal to 0.005 percent, and in the impurity elements, the content of Fe is less than or equal to 0.0005 percent, the content of Ni is less than or equal to 0.0005 percent, and the content of Cu is less than or equal to 0.001 percent. The invention also relates to a method for preparing the single-crystal magnesium alloy biodegradable material. According to the single-crystal magnesium alloy biodegradable material disclosed by the invention, the influence of the alloy grain boundary and precipitated phase on the corrosion resistance of the alloy can be eliminated, the mechanical property of the magnesium alloy biodegradable material at the treatment stage can be maintained, the metal ions can be completely formed in the degradation process to be absorbed by the human body or discharged out of the body, the degradation difficulty of metal compounds is avoided, and design diversity is provided for biological devices suitable for different patients and different parts.

Description

technical field [0001] The invention relates to a biomedical alloy material, in particular to a single crystal magnesium alloy biodegradable material and a preparation method thereof. Background technique [0002] At present, biodegradable absorbing materials in vivo are becoming a research hotspot of biomaterials, and the research of a new generation of medical metal materials mainly represented by biodegradable magnesium alloys has received special attention. Mg and Mg alloys have many properties superior to existing biomedical metal materials as biomedical materials, for example: (1) Mg (1.738g / cm 3 ) and its alloys (1.75~1.85g / cm 3 ) low density, less than 1 / 3 of medical titanium alloy, and human bone density (1.75g / cm 3 ) are similar; (2) Mg and Mg alloys have high specific strength and specific stiffness, Young's modulus is about 45GPa, which is less than 1 / 2 of the elastic modulus (110GPa) of medical titanium alloys, which can effectively relieve orthopedic implants...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/52C30B13/00
CPCC30B13/00C30B29/52
Inventor 任政黄原定朱秀荣张潇谭锁奎连付奎
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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